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authorThiemo Seufer <ths@networkno.de>2005-02-21 05:45:09 -0500
committerRalf Baechle <ralf@linux-mips.org>2005-10-29 14:30:39 -0400
commit4e6a05fe5f87efd58da16fbf61e1f6329575fcfd (patch)
treeed16ed0f4f0307373bba6f83e91fc6495add020b /arch
parent7ee8798f3756fc473e63abeba56fae3e192ce71f (diff)
Improved modules loader, more robust and works on 64bit kernels.
Signed-off-by: Thiemo Seufer <ths@networkno.de> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/kernel/Makefile6
-rw-r--r--arch/mips/kernel/module-elf32.c250
-rw-r--r--arch/mips/kernel/module-elf64.c274
-rw-r--r--arch/mips/kernel/module.c336
4 files changed, 337 insertions, 529 deletions
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index d3303584fbd1..d54964d52c83 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -11,11 +11,7 @@ obj-y += cpu-probe.o branch.o entry.o genex.o irq.o process.o \
11binfmt_irix-objs := irixelf.o irixinv.o irixioctl.o irixsig.o \ 11binfmt_irix-objs := irixelf.o irixinv.o irixioctl.o irixsig.o \
12 irix5sys.o sysirix.o 12 irix5sys.o sysirix.o
13 13
14ifdef CONFIG_MODULES 14obj-$(CONFIG_MODULES) += mips_ksyms.o module.o
15obj-y += mips_ksyms.o module.o
16obj-$(CONFIG_32BIT) += module-elf32.o
17obj-$(CONFIG_64BIT) += module-elf64.o
18endif
19 15
20obj-$(CONFIG_CPU_R3000) += r2300_fpu.o r2300_switch.o 16obj-$(CONFIG_CPU_R3000) += r2300_fpu.o r2300_switch.o
21obj-$(CONFIG_CPU_TX39XX) += r2300_fpu.o r2300_switch.o 17obj-$(CONFIG_CPU_TX39XX) += r2300_fpu.o r2300_switch.o
diff --git a/arch/mips/kernel/module-elf32.c b/arch/mips/kernel/module-elf32.c
deleted file mode 100644
index ffd216d6d6dc..000000000000
--- a/arch/mips/kernel/module-elf32.c
+++ /dev/null
@@ -1,250 +0,0 @@
1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 *
16 * Copyright (C) 2001 Rusty Russell.
17 * Copyright (C) 2003, 2004 Ralf Baechle (ralf@linux-mips.org)
18 */
19
20#undef DEBUG
21
22#include <linux/moduleloader.h>
23#include <linux/elf.h>
24#include <linux/vmalloc.h>
25#include <linux/slab.h>
26#include <linux/fs.h>
27#include <linux/string.h>
28#include <linux/kernel.h>
29
30struct mips_hi16 {
31 struct mips_hi16 *next;
32 Elf32_Addr *addr;
33 Elf32_Addr value;
34};
35
36static struct mips_hi16 *mips_hi16_list;
37
38void *module_alloc(unsigned long size)
39{
40 if (size == 0)
41 return NULL;
42 return vmalloc(size);
43}
44
45
46/* Free memory returned from module_alloc */
47void module_free(struct module *mod, void *module_region)
48{
49 vfree(module_region);
50 /* FIXME: If module_region == mod->init_region, trim exception
51 table entries. */
52}
53
54int module_frob_arch_sections(Elf_Ehdr *hdr,
55 Elf_Shdr *sechdrs,
56 char *secstrings,
57 struct module *mod)
58{
59 return 0;
60}
61
62static int apply_r_mips_none(struct module *me, uint32_t *location,
63 Elf32_Addr v)
64{
65 return 0;
66}
67
68static int apply_r_mips_32(struct module *me, uint32_t *location,
69 Elf32_Addr v)
70{
71 *location += v;
72
73 return 0;
74}
75
76static int apply_r_mips_26(struct module *me, uint32_t *location,
77 Elf32_Addr v)
78{
79 if (v % 4) {
80 printk(KERN_ERR "module %s: dangerous relocation\n", me->name);
81 return -ENOEXEC;
82 }
83
84 if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
85 printk(KERN_ERR
86 "module %s: relocation overflow\n",
87 me->name);
88 return -ENOEXEC;
89 }
90
91 *location = (*location & ~0x03ffffff) |
92 ((*location + (v >> 2)) & 0x03ffffff);
93
94 return 0;
95}
96
97static int apply_r_mips_hi16(struct module *me, uint32_t *location,
98 Elf32_Addr v)
99{
100 struct mips_hi16 *n;
101
102 /*
103 * We cannot relocate this one now because we don't know the value of
104 * the carry we need to add. Save the information, and let LO16 do the
105 * actual relocation.
106 */
107 n = kmalloc(sizeof *n, GFP_KERNEL);
108 if (!n)
109 return -ENOMEM;
110
111 n->addr = location;
112 n->value = v;
113 n->next = mips_hi16_list;
114 mips_hi16_list = n;
115
116 return 0;
117}
118
119static int apply_r_mips_lo16(struct module *me, uint32_t *location,
120 Elf32_Addr v)
121{
122 unsigned long insnlo = *location;
123 Elf32_Addr val, vallo;
124
125 /* Sign extend the addend we extract from the lo insn. */
126 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
127
128 if (mips_hi16_list != NULL) {
129 struct mips_hi16 *l;
130
131 l = mips_hi16_list;
132 while (l != NULL) {
133 struct mips_hi16 *next;
134 unsigned long insn;
135
136 /*
137 * The value for the HI16 had best be the same.
138 */
139 if (v != l->value)
140 goto out_danger;
141
142 /*
143 * Do the HI16 relocation. Note that we actually don't
144 * need to know anything about the LO16 itself, except
145 * where to find the low 16 bits of the addend needed
146 * by the LO16.
147 */
148 insn = *l->addr;
149 val = ((insn & 0xffff) << 16) + vallo;
150 val += v;
151
152 /*
153 * Account for the sign extension that will happen in
154 * the low bits.
155 */
156 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
157
158 insn = (insn & ~0xffff) | val;
159 *l->addr = insn;
160
161 next = l->next;
162 kfree(l);
163 l = next;
164 }
165
166 mips_hi16_list = NULL;
167 }
168
169 /*
170 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
171 */
172 val = v + vallo;
173 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
174 *location = insnlo;
175
176 return 0;
177
178out_danger:
179 printk(KERN_ERR "module %s: dangerous " "relocation\n", me->name);
180
181 return -ENOEXEC;
182}
183
184static int (*reloc_handlers[]) (struct module *me, uint32_t *location,
185 Elf32_Addr v) = {
186 [R_MIPS_NONE] = apply_r_mips_none,
187 [R_MIPS_32] = apply_r_mips_32,
188 [R_MIPS_26] = apply_r_mips_26,
189 [R_MIPS_HI16] = apply_r_mips_hi16,
190 [R_MIPS_LO16] = apply_r_mips_lo16
191};
192
193int apply_relocate(Elf32_Shdr *sechdrs,
194 const char *strtab,
195 unsigned int symindex,
196 unsigned int relsec,
197 struct module *me)
198{
199 Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr;
200 Elf32_Sym *sym;
201 uint32_t *location;
202 unsigned int i;
203 Elf32_Addr v;
204 int res;
205
206 pr_debug("Applying relocate section %u to %u\n", relsec,
207 sechdrs[relsec].sh_info);
208
209 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
210 Elf32_Word r_info = rel[i].r_info;
211
212 /* This is where to make the change */
213 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
214 + rel[i].r_offset;
215 /* This is the symbol it is referring to */
216 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
217 + ELF32_R_SYM(r_info);
218 if (!sym->st_value) {
219 printk(KERN_WARNING "%s: Unknown symbol %s\n",
220 me->name, strtab + sym->st_name);
221 return -ENOENT;
222 }
223
224 v = sym->st_value;
225
226 res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v);
227 if (res)
228 return res;
229 }
230
231 return 0;
232}
233
234int apply_relocate_add(Elf32_Shdr *sechdrs,
235 const char *strtab,
236 unsigned int symindex,
237 unsigned int relsec,
238 struct module *me)
239{
240 /*
241 * Current binutils always generate .rela relocations. Keep smiling
242 * if it's empty, abort otherwise.
243 */
244 if (!sechdrs[relsec].sh_size)
245 return 0;
246
247 printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
248 me->name);
249 return -ENOEXEC;
250}
diff --git a/arch/mips/kernel/module-elf64.c b/arch/mips/kernel/module-elf64.c
deleted file mode 100644
index e804792ee1ee..000000000000
--- a/arch/mips/kernel/module-elf64.c
+++ /dev/null
@@ -1,274 +0,0 @@
1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 *
16 * Copyright (C) 2001 Rusty Russell.
17 * Copyright (C) 2003, 2004 Ralf Baechle (ralf@linux-mips.org)
18 */
19
20#undef DEBUG
21
22#include <linux/moduleloader.h>
23#include <linux/elf.h>
24#include <linux/vmalloc.h>
25#include <linux/slab.h>
26#include <linux/fs.h>
27#include <linux/string.h>
28#include <linux/kernel.h>
29
30struct mips_hi16 {
31 struct mips_hi16 *next;
32 Elf32_Addr *addr;
33 Elf64_Addr value;
34};
35
36static struct mips_hi16 *mips_hi16_list;
37
38void *module_alloc(unsigned long size)
39{
40 if (size == 0)
41 return NULL;
42 return vmalloc(size);
43}
44
45
46/* Free memory returned from module_alloc */
47void module_free(struct module *mod, void *module_region)
48{
49 vfree(module_region);
50 /* FIXME: If module_region == mod->init_region, trim exception
51 table entries. */
52}
53
54int module_frob_arch_sections(Elf_Ehdr *hdr,
55 Elf_Shdr *sechdrs,
56 char *secstrings,
57 struct module *mod)
58{
59 return 0;
60}
61
62int apply_relocate(Elf64_Shdr *sechdrs,
63 const char *strtab,
64 unsigned int symindex,
65 unsigned int relsec,
66 struct module *me)
67{
68 /*
69 * We don't want to deal with REL relocations - RELA is so much saner.
70 */
71 if (!sechdrs[relsec].sh_size)
72 return 0;
73
74 printk(KERN_ERR "module %s: REL relocation unsupported\n",
75 me->name);
76 return -ENOEXEC;
77}
78
79static int apply_r_mips_none(struct module *me, uint32_t *location,
80 Elf64_Addr v)
81{
82 return 0;
83}
84
85static int apply_r_mips_32(struct module *me, uint32_t *location,
86 Elf64_Addr v)
87{
88 *location = v;
89
90 return 0;
91}
92
93static int apply_r_mips_26(struct module *me, uint32_t *location,
94 Elf64_Addr v)
95{
96 if (v % 4) {
97 printk(KERN_ERR "module %s: dangerous relocation\n", me->name);
98 return -ENOEXEC;
99 }
100
101 if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
102 printk(KERN_ERR
103 "module %s: relocation overflow\n",
104 me->name);
105 return -ENOEXEC;
106 }
107
108 *location = (*location & ~0x03ffffff) | ((v >> 2) & 0x03ffffff);
109
110 return 0;
111}
112
113static int apply_r_mips_hi16(struct module *me, uint32_t *location,
114 Elf64_Addr v)
115{
116 struct mips_hi16 *n;
117
118 /*
119 * We cannot relocate this one now because we don't know the value of
120 * the carry we need to add. Save the information, and let LO16 do the
121 * actual relocation.
122 */
123 n = kmalloc(sizeof *n, GFP_KERNEL);
124 if (!n)
125 return -ENOMEM;
126
127 n->addr = location;
128 n->value = v;
129 n->next = mips_hi16_list;
130 mips_hi16_list = n;
131
132 return 0;
133}
134
135static int apply_r_mips_lo16(struct module *me, uint32_t *location,
136 Elf64_Addr v)
137{
138 unsigned long insnlo = *location;
139 Elf32_Addr val, vallo;
140
141 /* Sign extend the addend we extract from the lo insn. */
142 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
143
144 if (mips_hi16_list != NULL) {
145 struct mips_hi16 *l;
146
147 l = mips_hi16_list;
148 while (l != NULL) {
149 struct mips_hi16 *next;
150 unsigned long insn;
151
152 /*
153 * The value for the HI16 had best be the same.
154 */
155 if (v != l->value)
156 goto out_danger;
157
158 /*
159 * Do the HI16 relocation. Note that we actually don't
160 * need to know anything about the LO16 itself, except
161 * where to find the low 16 bits of the addend needed
162 * by the LO16.
163 */
164 insn = *l->addr;
165 val = ((insn & 0xffff) << 16) + vallo;
166 val += v;
167
168 /*
169 * Account for the sign extension that will happen in
170 * the low bits.
171 */
172 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
173
174 insn = (insn & ~0xffff) | val;
175 *l->addr = insn;
176
177 next = l->next;
178 kfree(l);
179 l = next;
180 }
181
182 mips_hi16_list = NULL;
183 }
184
185 /*
186 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
187 */
188 insnlo = (insnlo & ~0xffff) | (v & 0xffff);
189 *location = insnlo;
190
191 return 0;
192
193out_danger:
194 printk(KERN_ERR "module %s: dangerous " "relocation\n", me->name);
195
196 return -ENOEXEC;
197}
198
199static int apply_r_mips_64(struct module *me, uint32_t *location,
200 Elf64_Addr v)
201{
202 *(uint64_t *) location = v;
203
204 return 0;
205}
206
207
208static int apply_r_mips_higher(struct module *me, uint32_t *location,
209 Elf64_Addr v)
210{
211 *location = (*location & 0xffff0000) |
212 ((((long long) v + 0x80008000LL) >> 32) & 0xffff);
213
214 return 0;
215}
216
217static int apply_r_mips_highest(struct module *me, uint32_t *location,
218 Elf64_Addr v)
219{
220 *location = (*location & 0xffff0000) |
221 ((((long long) v + 0x800080008000LL) >> 48) & 0xffff);
222
223 return 0;
224}
225
226static int (*reloc_handlers[]) (struct module *me, uint32_t *location,
227 Elf64_Addr v) = {
228 [R_MIPS_NONE] = apply_r_mips_none,
229 [R_MIPS_32] = apply_r_mips_32,
230 [R_MIPS_26] = apply_r_mips_26,
231 [R_MIPS_HI16] = apply_r_mips_hi16,
232 [R_MIPS_LO16] = apply_r_mips_lo16,
233 [R_MIPS_64] = apply_r_mips_64,
234 [R_MIPS_HIGHER] = apply_r_mips_higher,
235 [R_MIPS_HIGHEST] = apply_r_mips_highest
236};
237
238int apply_relocate_add(Elf64_Shdr *sechdrs,
239 const char *strtab,
240 unsigned int symindex,
241 unsigned int relsec,
242 struct module *me)
243{
244 Elf64_Mips_Rela *rel = (void *) sechdrs[relsec].sh_addr;
245 Elf64_Sym *sym;
246 uint32_t *location;
247 unsigned int i;
248 Elf64_Addr v;
249 int res;
250
251 pr_debug("Applying relocate section %u to %u\n", relsec,
252 sechdrs[relsec].sh_info);
253
254 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
255 /* This is where to make the change */
256 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
257 + rel[i].r_offset;
258 /* This is the symbol it is referring to */
259 sym = (Elf64_Sym *)sechdrs[symindex].sh_addr + rel[i].r_sym;
260 if (!sym->st_value) {
261 printk(KERN_WARNING "%s: Unknown symbol %s\n",
262 me->name, strtab + sym->st_name);
263 return -ENOENT;
264 }
265
266 v = sym->st_value;
267
268 res = reloc_handlers[rel[i].r_type](me, location, v);
269 if (res)
270 return res;
271 }
272
273 return 0;
274}
diff --git a/arch/mips/kernel/module.c b/arch/mips/kernel/module.c
index 458af3c7a639..e54a7f442f8a 100644
--- a/arch/mips/kernel/module.c
+++ b/arch/mips/kernel/module.c
@@ -1,9 +1,345 @@
1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 *
16 * Copyright (C) 2001 Rusty Russell.
17 * Copyright (C) 2003, 2004 Ralf Baechle (ralf@linux-mips.org)
18 * Copyright (C) 2005 Thiemo Seufer
19 */
20
21#undef DEBUG
22
23#include <linux/moduleloader.h>
24#include <linux/elf.h>
25#include <linux/vmalloc.h>
26#include <linux/slab.h>
27#include <linux/fs.h>
28#include <linux/string.h>
29#include <linux/kernel.h>
1#include <linux/module.h> 30#include <linux/module.h>
2#include <linux/spinlock.h> 31#include <linux/spinlock.h>
3 32
33struct mips_hi16 {
34 struct mips_hi16 *next;
35 Elf_Addr *addr;
36 Elf_Addr value;
37};
38
39static struct mips_hi16 *mips_hi16_list;
40
4static LIST_HEAD(dbe_list); 41static LIST_HEAD(dbe_list);
5static DEFINE_SPINLOCK(dbe_lock); 42static DEFINE_SPINLOCK(dbe_lock);
6 43
44void *module_alloc(unsigned long size)
45{
46 if (size == 0)
47 return NULL;
48 return vmalloc(size);
49}
50
51/* Free memory returned from module_alloc */
52void module_free(struct module *mod, void *module_region)
53{
54 vfree(module_region);
55 /* FIXME: If module_region == mod->init_region, trim exception
56 table entries. */
57}
58
59int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
60 char *secstrings, struct module *mod)
61{
62 return 0;
63}
64
65static int apply_r_mips_none(struct module *me, u32 *location, Elf_Addr v)
66{
67 return 0;
68}
69
70static int apply_r_mips_32_rel(struct module *me, u32 *location, Elf_Addr v)
71{
72 *location += v;
73
74 return 0;
75}
76
77static int apply_r_mips_32_rela(struct module *me, u32 *location, Elf_Addr v)
78{
79 *location = v;
80
81 return 0;
82}
83
84static int apply_r_mips_26_rel(struct module *me, u32 *location, Elf_Addr v)
85{
86 if (v % 4) {
87 printk(KERN_ERR "module %s: dangerous relocation\n", me->name);
88 return -ENOEXEC;
89 }
90
91 if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
92 printk(KERN_ERR
93 "module %s: relocation overflow\n",
94 me->name);
95 return -ENOEXEC;
96 }
97
98 *location = (*location & ~0x03ffffff) |
99 ((*location + (v >> 2)) & 0x03ffffff);
100
101 return 0;
102}
103
104static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v)
105{
106 if (v % 4) {
107 printk(KERN_ERR "module %s: dangerous relocation\n", me->name);
108 return -ENOEXEC;
109 }
110
111 if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
112 printk(KERN_ERR
113 "module %s: relocation overflow\n",
114 me->name);
115 return -ENOEXEC;
116 }
117
118 *location = (*location & ~0x03ffffff) | ((v >> 2) & 0x03ffffff);
119
120 return 0;
121}
122
123static int apply_r_mips_hi16_rel(struct module *me, u32 *location, Elf_Addr v)
124{
125 struct mips_hi16 *n;
126
127 /*
128 * We cannot relocate this one now because we don't know the value of
129 * the carry we need to add. Save the information, and let LO16 do the
130 * actual relocation.
131 */
132 n = kmalloc(sizeof *n, GFP_KERNEL);
133 if (!n)
134 return -ENOMEM;
135
136 n->addr = (Elf_Addr *)location;
137 n->value = v;
138 n->next = mips_hi16_list;
139 mips_hi16_list = n;
140
141 return 0;
142}
143
144static int apply_r_mips_hi16_rela(struct module *me, u32 *location, Elf_Addr v)
145{
146 *location = (*location & 0xffff0000) |
147 ((((long long) v + 0x8000LL) >> 16) & 0xffff);
148
149 return 0;
150}
151
152static int apply_r_mips_lo16_rel(struct module *me, u32 *location, Elf_Addr v)
153{
154 unsigned long insnlo = *location;
155 Elf_Addr val, vallo;
156
157 /* Sign extend the addend we extract from the lo insn. */
158 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
159
160 if (mips_hi16_list != NULL) {
161 struct mips_hi16 *l;
162
163 l = mips_hi16_list;
164 while (l != NULL) {
165 struct mips_hi16 *next;
166 unsigned long insn;
167
168 /*
169 * The value for the HI16 had best be the same.
170 */
171 if (v != l->value)
172 goto out_danger;
173
174 /*
175 * Do the HI16 relocation. Note that we actually don't
176 * need to know anything about the LO16 itself, except
177 * where to find the low 16 bits of the addend needed
178 * by the LO16.
179 */
180 insn = *l->addr;
181 val = ((insn & 0xffff) << 16) + vallo;
182 val += v;
183
184 /*
185 * Account for the sign extension that will happen in
186 * the low bits.
187 */
188 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
189
190 insn = (insn & ~0xffff) | val;
191 *l->addr = insn;
192
193 next = l->next;
194 kfree(l);
195 l = next;
196 }
197
198 mips_hi16_list = NULL;
199 }
200
201 /*
202 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
203 */
204 val = v + vallo;
205 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
206 *location = insnlo;
207
208 return 0;
209
210out_danger:
211 printk(KERN_ERR "module %s: dangerous " "relocation\n", me->name);
212
213 return -ENOEXEC;
214}
215
216static int apply_r_mips_lo16_rela(struct module *me, u32 *location, Elf_Addr v)
217{
218 *location = (*location & 0xffff0000) | (v & 0xffff);
219
220 return 0;
221}
222
223static int apply_r_mips_64_rela(struct module *me, u32 *location, Elf_Addr v)
224{
225 *(Elf_Addr *)location = v;
226
227 return 0;
228}
229
230static int apply_r_mips_higher_rela(struct module *me, u32 *location,
231 Elf_Addr v)
232{
233 *location = (*location & 0xffff0000) |
234 ((((long long) v + 0x80008000LL) >> 32) & 0xffff);
235
236 return 0;
237}
238
239static int apply_r_mips_highest_rela(struct module *me, u32 *location,
240 Elf_Addr v)
241{
242 *location = (*location & 0xffff0000) |
243 ((((long long) v + 0x800080008000LL) >> 48) & 0xffff);
244
245 return 0;
246}
247
248static int (*reloc_handlers_rel[]) (struct module *me, u32 *location,
249 Elf_Addr v) = {
250 [R_MIPS_NONE] = apply_r_mips_none,
251 [R_MIPS_32] = apply_r_mips_32_rel,
252 [R_MIPS_26] = apply_r_mips_26_rel,
253 [R_MIPS_HI16] = apply_r_mips_hi16_rel,
254 [R_MIPS_LO16] = apply_r_mips_lo16_rel
255};
256
257static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
258 Elf_Addr v) = {
259 [R_MIPS_NONE] = apply_r_mips_none,
260 [R_MIPS_32] = apply_r_mips_32_rela,
261 [R_MIPS_26] = apply_r_mips_26_rela,
262 [R_MIPS_HI16] = apply_r_mips_hi16_rela,
263 [R_MIPS_LO16] = apply_r_mips_lo16_rela,
264 [R_MIPS_64] = apply_r_mips_64_rela,
265 [R_MIPS_HIGHER] = apply_r_mips_higher_rela,
266 [R_MIPS_HIGHEST] = apply_r_mips_highest_rela
267};
268
269int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
270 unsigned int symindex, unsigned int relsec,
271 struct module *me)
272{
273 Elf_Mips_Rel *rel = (void *) sechdrs[relsec].sh_addr;
274 Elf_Sym *sym;
275 u32 *location;
276 unsigned int i;
277 Elf_Addr v;
278 int res;
279
280 pr_debug("Applying relocate section %u to %u\n", relsec,
281 sechdrs[relsec].sh_info);
282
283 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
284 /* This is where to make the change */
285 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
286 + rel[i].r_offset;
287 /* This is the symbol it is referring to */
288 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
289 + ELF_MIPS_R_SYM(rel[i]);
290 if (!sym->st_value) {
291 printk(KERN_WARNING "%s: Unknown symbol %s\n",
292 me->name, strtab + sym->st_name);
293 return -ENOENT;
294 }
295
296 v = sym->st_value;
297
298 res = reloc_handlers_rel[ELF_MIPS_R_TYPE(rel[i])](me, location, v);
299 if (res)
300 return res;
301 }
302
303 return 0;
304}
305
306int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
307 unsigned int symindex, unsigned int relsec,
308 struct module *me)
309{
310 Elf_Mips_Rela *rel = (void *) sechdrs[relsec].sh_addr;
311 Elf_Sym *sym;
312 u32 *location;
313 unsigned int i;
314 Elf_Addr v;
315 int res;
316
317 pr_debug("Applying relocate section %u to %u\n", relsec,
318 sechdrs[relsec].sh_info);
319
320 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
321 /* This is where to make the change */
322 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
323 + rel[i].r_offset;
324 /* This is the symbol it is referring to */
325 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
326 + ELF_MIPS_R_SYM(rel[i]);
327 if (!sym->st_value) {
328 printk(KERN_WARNING "%s: Unknown symbol %s\n",
329 me->name, strtab + sym->st_name);
330 return -ENOENT;
331 }
332
333 v = sym->st_value + rel[i].r_addend;
334
335 res = reloc_handlers_rela[ELF_MIPS_R_TYPE(rel[i])](me, location, v);
336 if (res)
337 return res;
338 }
339
340 return 0;
341}
342
7/* Given an address, look for it in the module exception tables. */ 343/* Given an address, look for it in the module exception tables. */
8const struct exception_table_entry *search_module_dbetables(unsigned long addr) 344const struct exception_table_entry *search_module_dbetables(unsigned long addr)
9{ 345{
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-24 15:56:08 -0500